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Institutional Investment Manager
DEERFIELD MANAGEMENT COMPANY, L.P.
DEERFIELD MANAGEMENT COMPANY, L.P. (CIK: 0001009258) incorporated in Delaware, located at 345 Park Avenue South, 12th Floor, New York, NY. Institutional holdings reported to the SEC.

Institutional Holdings (2016Q1)
Portfolio Summary: 105 holdings with a total value of $2,348,708,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 HORIZON PHARMA PLC 13,740,261 227,676,000 9.69%
2 MYLAN N V 1,832,535 84,938,000 3.62%
3 NXSTAGE MED INC COM 5,506,028 82,535,000 3.51%
4 HEALTHWAYS INC 76,925,000 70,595,000 3.01% PRN
5 HORIZON PHARMA INVT LTD 82,600,000 70,475,000 3.00% PRN
6 GLAXOSMITHKLINE PLC 1,675,385 67,937,000 2.89%
7 AETNA INC NEW 591,465 66,451,000 2.83%
8 PORTOLA PHARMACEUTICALS INC 3,089,785 63,032,000 2.68%
9 AVEXIS INC COM 2,236,701 60,928,000 2.59%
10 DAVITA INC 822,000 60,318,000 2.57%
11 EDITAS MEDICINE INCORPORATED 1,709,400 59,043,000 2.51%
12 Adeptus Health Inc 956,533 53,126,000 2.26%
13 XENOPORT INC 11,572,125 52,190,000 2.22%
14 VANDA PHARMACEUTICALS INC COM 5,996,691 50,132,000 2.13%
15 GW PHARMACEUTICALS PLC 674,373 48,656,000 2.07%
16 XENCOR INC COM 3,467,512 46,534,000 1.98%
17 AAC HLDGS INC COM 2,294,936 45,417,000 1.93%
18 FLAMEL TECHNOLOGIES SA SPONSORED ADR 4,072,809 44,964,000 1.91%
19 WALGREENS BOOTS ALLIANCE INC 511,457 43,085,000 1.83%
20 ENDOLOGIX INC 40,000,000 38,632,000 1.64% PRN
21 UNIVERSAL AMERN CORP NEW 5,285,500 37,738,000 1.61%
22 HEARTWARE INTL INC 39,226,000 36,498,000 1.55% PRN
23 WRIGHT MED GROUP INC 40,050,000 35,961,000 1.53% PRN
24 ARRAY BIOPHARMA INC 3 06/01/2020 45,000,000 35,876,000 1.53% PRN
25 SAGE THERAPEUTICS 1,113,654 35,704,000 1.52%
26 AERIE PHARMACEUTICALS INC 2,632,482 32,011,000 1.36%
27 EHEALTH INC COM 3,264,588 30,654,000 1.31%
28 ZELTIQ AESTHETICS INCORPORATED 1,104,417 29,996,000 1.28%
29 ENDOLOGIX INC 40,941,000 29,871,000 1.27% PRN
30 ARRAY BIOPHARMA INC COM 9,529,361 28,112,000 1.20%
31 FIVE PRIME THERAPEUTICS INC 680,000 27,628,000 1.18%
32 MCKESSON CORP 175,000 27,519,000 1.17%
33 Heartware International, Inc. 870,634 27,355,000 1.16%
34 ACORDA THERAPEUTICS 1,029,410 27,228,000 1.16%
35 DBV TECHNOLOGIES 817,806 26,620,000 1.13%
36 RELYPSA INC 1,873,471 25,386,000 1.08%
37 HEALTHWAYS INC 2,475,387 24,977,000 1.06%
38 SPECTRANETICS CORP 29,831,000 23,643,000 1.01% PRN
39 INFINITY PHARMACEUTICALS INC COM 4,398,862 23,182,000 0.99%
40 KEMPHARM INC 1,420,497 20,597,000 0.88%
41 ZAFGEN INC COM 3,055,603 20,411,000 0.87%
42 ProNAi Therapeutics, Inc. 3,001,302 20,229,000 0.86%
43 RITE AID CORP 2,393,072 19,504,000 0.83%
44 GLOBAL BLOOD THERAPEUTICS IN COM 1,193,811 18,934,000 0.81%
45 AXOGEN INC 3,381,439 18,125,000 0.77%
46 AKARI THERAPEUTICS PLC 1,150,700 16,110,000 0.69%
47 Nivalis Therapeutics Inc 3,732,412 15,564,000 0.66%
48 FLUIDIGM CORP DEL 27,715,000 15,353,000 0.65% PRN
49 ANTHEM INC 102,000 14,177,000 0.60%
50 GALAPAGOS NV 327,626 13,701,000 0.58%
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Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001140361-16-065661, filed 2016.05.16).

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.